The blank is surface or surface of land
Option B (Sudan)
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An atoll estuary serves as the term that used in referring to rising of sea level which do results to invasion of the river valley which produces a nearshore body of water of mixed as well as variable salinity.
- In an estuary, there us usually mixing of freshwater river or stream aa well as ocean.
This will result to<u> salty ocean</u> mixing with a freshwater river, and brackish water will be formed.
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